Not a group of 10, 15, 20, 25 or 50. It's always a very small group, usually less than six. Because it's just more epic that way.
You see, you aren't really liking raids for the gameplay. You like them because they gave you tangible advantages over other players, who couldn't participate in them for sheduling issues. This gave yourself an advantage ingame, and you now try to pretend the gameplay was what made you enjoy it.
Bzzt. Wrong. You enjoyed the feeling of being more special and the game setting it up so you would always remain so.Fact: Adding more players brings nothing valuable to the table.
Fact:4-5 people is, in fact, the ideal size for a group. This is actually based on human psychology, and true in every single field of human interaction. This is why you rarely find board games with more than 5 players.
Ever wondered about *why* that was?
Raids are not difficult, raids require little actual gameplay coordination. Raid require sheduling. That's it.
People that can shedule their life around a game obviously want raids, because raids give them boni that other people can't get (or get far, far slower).
And that's why everyone else doesn't want raids, and why GW2 wisely will not have any.
Big selling point
Want raids? Well, there's games that cater to that. Go play those instead.
Don't come crying that a vegetarian restaurant doesn't sell you living rat babies to swallow as a delicacy (actual dish, look it up). Go to an actual chinese restaurant for that. Vegetarian restaurants are not for that.Just like GW2 is not for raiding.